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Amazon.com: Bridgold 50pcs PC817c PC817 for Arduino DIY Through Hole transistor output optocoupler,4-Pin : Industrial & Scientific
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An Optocoupler Doorbell Notifier | Hackaday
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Super simple DIY optocoupler - Adding optical isolation in electronic circuits - YouTube
How To Make an Optocoupler Tester Circuit At Home
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Use an optocoupler to make a simple low-dropout regulator - EDN
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